Thank you @MickeyCheeky and @bpcyclist !!!

I'm 36, my brother is 34. We are grown adults. I live on my own, not with them. My brother does live with them. I just stopped by there today to say hello, and decided to go with them. I do get financial support from my parents as I'm disabled, but I am working on getting a job. We do not fight like that very often. It has happened, but since I've improved myself and grown in the last 3 years, its happened much less. I try not to engage w him in a fight like that. I noticed though, that he has tried to engage me in a fight a few times in the recent past. This time we were in a car. There was nowhere to escape. I tried my best. I know I said some things on impulse too today that pissed him off. Like I said I didn't care. That's not true, I do. But I needed to get away from him. He was SO worked up and barraging me w anger and some insults and the things he was saying seemed distorted (like that I deliberately slammed the door to be hurtful to him).

I really wish my mother would get therapy. And my brother.